Fuse-plug.



PATENTED JAN; 9, 1905.

H. Ts PAISTE.

FUSE PLUG.

APPLIQATIQH FILED Nov. 23.1904.

HIM

HENRY T. PAlSTE, OF PHILADELPHIA, PENNSYLVANIA.

FUSE-PLUG.

Speccaton of Letters Patent,

Patented Jan. 9, 1906 Application filed November 23, 1904. Serial No.234,029.

To r11/ZZ lull/077@ t may concern:

Be it known that l, HENRYT. PAIS/rn, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Fuse-Plugs, of which the following is a-speci'lieation.

My invention relates to that type of fuseplug especially designed toreceive a cartridge-fuse, the object of the invention being to provide arelatively simple and inexpensive device of the general character abovenoted which may be screwed into a cut-out of the ordinary constructionand whose parts shall be conveniently accessible if it is desired toinspect or replace a fuse. These objects I attain as hereinafter setforth, reference being had to the accompanying drawings, in Which-Figure 1 is a sectional elevation of my improved fuse-plug, particularlyillustrating its detail construction. Fig. 2 is a sectional elevation ofmy improved plug, taken in aplane at right angles to the plane of Fig.1.` Fig. 3 is a sectional perspective view further illustrating thedisposition of the various parts of the plug, and Fig. 4 is a modifiedform of one portion of my improved fuse-plug.

In the above drawings, A is a metallic shell open at one end and closedat the opposite end by a block or head B, of porcelain or otherinsulating material. Said head is held in position bythe turned-overedge of the shell A, which is threaded and is preferably, though notnecessarily, provided with an insulating-lining C, usually 'of fiber. ltwill be seen that the porcelain piece B is of substantially the form ofa truncated cone and has on its end of smaller diameter a metallic platel) in electrical connection with a second metallic plate 1) within theshell A. In. the preferred construction of my device this second plateor an equivalent structure holds in position a pair of spring-clips b2,whose adj acent faces are made concave and whose upper edges are flangedoutwardly to a slight extent. Small bolts or rivets a hold theinsulating-lining C to the threaded shell A, in addition formingelectrical connection between said shell and a second pair of metallicspring clips D, which project beyond the open end of the shell A and,like the springclips b2, have their adjacent faces concave in form andtheir upper edges flanged outwardly.

- E is an insulating-tubeforming the case of a cartridge-fuse, which isof the well-known cyl l l i lindrical form and provided with metalliccaps or end portions e, which fit upon the body formed by theinsulating-tube E. lt will be seen that one pair of spring-clips, as b2,is placed to receive and engage one of the metallic ends of thefuse-case, while the second pair, which, as noted, preferably projectout" side of the threaded shell, is arranged to receive the secondmetallic end of the fuse-case.

A cap or covcr-piece,`of porcelain or other insulating material F, hasits interior thread ed, so that it may be screwed over that end of thefuse-plug which has the outwardlyprojecting clips D, the opposite end ofsaid plug being adapted to be screwed into a cutout. ln order to mostsatisfactorily retain the fusecase in position, l preferably so placethe spring-clips lf2 and D that one set of them engage the said case atpoints upon the surface of one cap e substantially ninety degrees fromthe points at which the other cap is engaged by the second set of clips.lf desired, the cover F may be omitted, since it is only used in caseswhere it is undesirable to have the live portions of the plug exposed.

Vilith the above-described arrangement of parts it will be seen that thefuse-case may be mest conveniently removed from the open end of the plugwithout the necessity of unscrewing this latter from the cut-out blockin which it is used, it beingipossible, moreover, te examine thecondition of the fuse without even taking it from the plug, since withcartridge-fuses of the ordinary construction the indicator-opening ewill be in plain view when the fuse-case is in operative position in myimproved plug.

lf considered advisable, the pair of clips which project outside theshell may be made integral with said shell, as illustrated in Fig. 4 atD. In any case, however, they are so formed and arranged as to permit ofthe removal of the fuse-case from the open end of the shell.

I claim as my invention* l.. The combination in a fuse-plug of ametallic shell and a plate at one end of the same, together forming theterminals of the plug, spring-clips respectively in permanent electricalconnection with said terminals, and a cartridge-fuse having terminalsplaced to be engaged by said clips, substantially as described.

2. The combination in a fuse-plug of a metallic shell having at one enda metallic plate, respectively forming with said shell the ter- IOOminals of the plug, a cartridge-fuse, and clips for said `fuserespectively in electrical connection with said plug-terminals, a clipor clips extending beyond the end ot the shell, substantially asdescribed.

3. In afuse-plug the combination of a fusecarrier, ametallic shell ofless length than said carrier, a clip or clips connected to the shelland projecting beyond the same 'for engaging one terminal of thefuse-carrier, a terminal plate, and a second clip connected thereto forengaging the second terminal ol2 the fuse-carrier, substantially asdescribed.

4. In a fuse-plug the ycombination of a metallic shell having aninsulating-lining and a piece of insulating material permanently closingone of its ends, a plate carried by said closing-piece having connectedto it a springclip, with a second spring-clip permanently connected tothe shell, both o'lE said clips being constructed to have the circuitbetween them completed through a fuse, substantially as described.

5. The combination in a vfuse-plug of a metallic shell and a platerespectively forming the terminals of the plug, two clips respectivelyconnected to said terminals, one of said clips being within the shelland the other outside of the same, with a removable cover 'fitting onthe end of the shell having the outer' clip, substantially as described.

6. The combination in a fuse-plug of a threaded 'shell having a cover ofinsulating material screwed over one end, a terminal piece at the otherend of said plug and springclips respectively in permanent electricalconnection with the shell and with the terminal piece, substantially asdescribed.

7. The combination of a metallic shell, an end piece therefor ofinsulating material, a terminal piece carried by said end piece, ametallic clip or clips within the shell in connection with the terminalpiece, a second clip or clips connected to the shell and extendingbeyond the end of the same, and a Jfuse having terminal pieces shaped toelectrically connect with said two clips, substantially as described.

8. The combination of a metallic shell, an end piece of insulatingmaterial therefor, a terminal piece carried by said end piece, ametallic clip or clips within the shell in connection with the terminalpiece, a second clip or clips connected to the shell and extendingbeyond the end of the same, and a fuse having terminal pieces shaped toelectrically connect with said two clips, the end of the shell havingthe projecting clip or clips being provided with a removable cover,substantially as described.

9. The combination in a -fuse-plug of a shell, an insulating-liningtherefor, a spring clip, a device for electrically connecting said clipand shell, said device also holding said lining in position, a terminalplate insulated `from the shell, and a spring-clip connected to saidplate, said two clips being shaped to Areceive a cartridge-fuse,substantially as described.

10. In a fuse-plug, the combination et a casing having terminalsincluding a terminal plate at one end of said casing adapted to engagethe contact-piece o'lt a cut-out, the opposite end of said fuse-plugbeing open, a cartridge-'fusc removable from said open end, and meanspermanently carried by the casing l'or forming electrical connectionbetween the terminals ol' said cartridge-fuse and the terminals of theplug, substantially as described.

11. In a fuse-plug, a metallic shell having an insulated terminal plateat one end adapted to engage a contact-piece in a cut-out, the oppositeend of said fuse-plug being open, a cartridge-fuse removable from saidopen end, and means for `forming electrical connection between theterminals of said cartridge-'fuse and the shell and terminal platerespectively, with a removable cover independent of said connectingmeans for closing the open end ol said shell, the electrical circuit ofthe plug being independent of said cover, substantially as described.

12. The combination in a fuse-plug of a supporting-body, a metallicshell and a terminal piece on said body, a cartridge-luso, and meanselectrically connected to the shell and to the terminal piece forrespectively forming electrical connection with the terminals of thefuse, the fuse having an indicatoropening in a portion oli its bodybeyond the end of the plug when said fuse is in position in the plug,substantially as described.

13. The combination in a fuse-plug o'l a metallic shell anda terminalpiece adapted 'for engagement with the terminals of a eutout, acartridge-fuse, and terminal clips respectively connected to the shelland to the said terminal piece, said clips being constructed to beelectrically connected by the-cartridge-fuse, said fuse projectingbeyond one end of the metallic shell so that its indicatoropening isvisible while the 'fuse is in such position as to complete the circuitbetween the terminals of the plug, substantially as dcscribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY T. PAIS'IIC.

Iitnesses:

WALTER CHIsM, Jos. H. KLEIN. f

IOC

IIO

